3DPrinting

15677 readers

105 users here now

3DPrinting is a place where makers of all skill levels and walks of life can learn about and discuss 3D printing and development of 3D printed parts and devices.

The r/functionalprint community is now located at: [email protected] or [email protected]

There are CAD communities available at: [email protected] or [email protected]

Rules

No bigotry - including racism, sexism, ableism, homophobia, transphobia, or xenophobia. Code of Conduct.
Be respectful, especially when disagreeing. Everyone should feel welcome here.
No porn (NSFW prints are acceptable but must be marked NSFW)
No Ads / Spamming / Guerrilla Marketing
Do not create links to reddit
If you see an issue please flag it
No guns
No injury gore posts

If you need an easy way to host pictures, https://catbox.moe may be an option. Be ethical about what you post and donate if you are able or use this a lot. It is just an individual hosting content, not a company. The image embedding syntax for Lemmy is ![](URL)

Moderation policy: Light, mostly invisible

founded 2 years ago

MODERATORS

Blobbing on outside walls Bambu PETG Basic, drying issue? (lemmy.world)

submitted 10 months ago* (last edited 10 months ago) by Jawa to c/3dprinting

21 comments fedilink hide all child comments

Edit: Setting the max speed for walls to 50 mm/s solved it! I feel like this should be limited when you select the filament, but oh well.

Hey, so I have recently gotten a Bambu A1 and got a roll of PLA and PETG. The PLA is printing very nicely out of the box but the PETG not so much. Since I'm still very much at the beginning of my 3D printing journey, I don't really have a good way of drying my PETG yet, I just stuffed it in a plastic ziplock bag with all the desiccant bags I got from the rolls and printer and stored it that way. I'm already planning to print myself a filament enclosure, I just haven't gotten around to buying the bearings, etc for it.

I've done some functional prints with no angled (overhanging) walls and they have turned out pretty good. When printing on supports the overhangs are ugly af, but no weird pattern like this.

The issue I'm tracking down seems to occur on ~60+° overhangs, that really shouldn't be an issue. I've done a sliced test print and took some photos, any idea what causes this?
Thanks :)

Bambu A1, standard 0.4mm nozzle
Bambu PETG Basic filament and profile using Bambu Studio
Some settings I played around with was flow rate (0.94->0.95) and layer height (0.2mm -> 0.15mm) but it seems to make no difference.

(note, on some of them the part is photographed upside down.)

you are viewing a single comment's thread
view the rest of the comments

[–] Jawa 3 points 10 months ago* (last edited 10 months ago) (1 children)

It's kinda not at the start or end of the layer. The layer starts with the inner wall, which prints fine and then it does the outer wall which doesn't do fine.

Which corresponds to the wall here

What slicer are you using?

Bambu Studio 1.8.4.51

[–] IMALlama 2 points 10 months ago (1 children)

Are you sure that's not the end of the outer wall? You can find out by going to the gcode preview, using the vertical control on the right of the screen to get to a layer with this issue, and then using the horizontal control at the bottom of tge screen to see the print order.

Do you have pressure advance? If so, it might be worth a tune.

[–] Jawa 3 points 10 months ago (1 children)

I added some pics

[–] IMALlama 2 points 10 months ago (1 children)

Got them! It seems like you might have found your answer elsewhere. I'm somewhat surprised the underextrusion is so localized, but if you're off and running then be happy I guess.

[–] Jawa 2 points 10 months ago

well it was less underextrusion and more the printhead just trying to go supersonic at those spots and the material just didn't flow fast enough :D